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| Schematic of the optical characterization setup; inset: region of interest for experiments. b The pulsed laser is modulated in time to match the positive semi-period of the sinusoidal signal feeding the transducer. c Experimental images of the laser beam when the ultrasonic transducer is off and (d) when it is turned on (fres = 832 kHz, V = 34 V). e, f Optical ray tracing simulations of the laser beam for the same frequency and voltages used for the experiments in c and d. |
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